1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for the Analog Devices digital potentiometers (I2C bus) 4 * 5 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc. 6 */ 7 8 #include <linux/i2c.h> 9 #include <linux/module.h> 10 11 #include "ad525x_dpot.h" 12 13 /* I2C bus functions */ 14 static int write_d8(void *client, u8 val) 15 { 16 return i2c_smbus_write_byte(client, val); 17 } 18 19 static int write_r8d8(void *client, u8 reg, u8 val) 20 { 21 return i2c_smbus_write_byte_data(client, reg, val); 22 } 23 24 static int write_r8d16(void *client, u8 reg, u16 val) 25 { 26 return i2c_smbus_write_word_data(client, reg, val); 27 } 28 29 static int read_d8(void *client) 30 { 31 return i2c_smbus_read_byte(client); 32 } 33 34 static int read_r8d8(void *client, u8 reg) 35 { 36 return i2c_smbus_read_byte_data(client, reg); 37 } 38 39 static int read_r8d16(void *client, u8 reg) 40 { 41 return i2c_smbus_read_word_data(client, reg); 42 } 43 44 static const struct ad_dpot_bus_ops bops = { 45 .read_d8 = read_d8, 46 .read_r8d8 = read_r8d8, 47 .read_r8d16 = read_r8d16, 48 .write_d8 = write_d8, 49 .write_r8d8 = write_r8d8, 50 .write_r8d16 = write_r8d16, 51 }; 52 53 static int ad_dpot_i2c_probe(struct i2c_client *client) 54 { 55 const struct i2c_device_id *id = i2c_client_get_device_id(client); 56 struct ad_dpot_bus_data bdata = { 57 .client = client, 58 .bops = &bops, 59 }; 60 61 if (!i2c_check_functionality(client->adapter, 62 I2C_FUNC_SMBUS_WORD_DATA)) { 63 dev_err(&client->dev, "SMBUS Word Data not Supported\n"); 64 return -EIO; 65 } 66 67 return ad_dpot_probe(&client->dev, &bdata, id->driver_data, id->name); 68 } 69 70 static void ad_dpot_i2c_remove(struct i2c_client *client) 71 { 72 ad_dpot_remove(&client->dev); 73 } 74 75 static const struct i2c_device_id ad_dpot_id[] = { 76 {"ad5258", AD5258_ID}, 77 {"ad5259", AD5259_ID}, 78 {"ad5251", AD5251_ID}, 79 {"ad5252", AD5252_ID}, 80 {"ad5253", AD5253_ID}, 81 {"ad5254", AD5254_ID}, 82 {"ad5255", AD5255_ID}, 83 {"ad5241", AD5241_ID}, 84 {"ad5242", AD5242_ID}, 85 {"ad5243", AD5243_ID}, 86 {"ad5245", AD5245_ID}, 87 {"ad5246", AD5246_ID}, 88 {"ad5247", AD5247_ID}, 89 {"ad5248", AD5248_ID}, 90 {"ad5280", AD5280_ID}, 91 {"ad5282", AD5282_ID}, 92 {"adn2860", ADN2860_ID}, 93 {"ad5273", AD5273_ID}, 94 {"ad5161", AD5161_ID}, 95 {"ad5171", AD5171_ID}, 96 {"ad5170", AD5170_ID}, 97 {"ad5172", AD5172_ID}, 98 {"ad5173", AD5173_ID}, 99 {"ad5272", AD5272_ID}, 100 {"ad5274", AD5274_ID}, 101 {} 102 }; 103 MODULE_DEVICE_TABLE(i2c, ad_dpot_id); 104 105 static struct i2c_driver ad_dpot_i2c_driver = { 106 .driver = { 107 .name = "ad_dpot", 108 }, 109 .probe_new = ad_dpot_i2c_probe, 110 .remove = ad_dpot_i2c_remove, 111 .id_table = ad_dpot_id, 112 }; 113 114 module_i2c_driver(ad_dpot_i2c_driver); 115 116 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 117 MODULE_DESCRIPTION("digital potentiometer I2C bus driver"); 118 MODULE_LICENSE("GPL"); 119